title: Challenges of using in vitro data for modeling P-glycoprotein efflux in the blood-brain barrier.
abstract: The efficacy of central nervous system (CNS) drugs may be limited by their poor ability to cross the bloodbrain barrier (BBB). Transporters, such as p-glycoprotein, may affect the distribution of many drugs into the CNS in conjunction with the restricted paracellular pathway of the BBB. It is therefore important to gain information on unbound drug concentrations in the brain in drug development to ensure sufficient drug exposure from plasma at the target site in the CNS. In vitro methods are routinely used in drug development to study passive permeability and p-glycoprotein efflux of new drugs. This review discusses the challenges in the use of in vitro data as input parameters in physiologically based pharmacokinetic (PBPK) models of CNS drug disposition of p-glycoprotein substrates. Experience with quinidine demonstrates the variability in in vitro parameters of passive permeability and active pglycoprotein efflux. Further work is needed to generate parameter values that are independent of the model and assay. This is a prerequisite for reliable predictions of drug concentrations in the brain in vivo.
authors.forename: Noora
authors.initials: N
authors.lastname: Sjöstedt
authors.forename: Hanna
authors.initials: H
authors.lastname: Kortejärvi
authors.forename: Heidi
authors.initials: H
authors.lastname: Kidron
authors.forename: Kati-Sisko
authors.initials: KS
authors.lastname: Vellonen
authors.forename: Arto
authors.initials: A
authors.lastname: Urtti
authors.forename: Marjo
authors.initials: M
authors.lastname: Yliperttula
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B / Q000378:metabolism*; D000818:Animals; D001692:Biological Transport / Q000187:drug effects* / Q000502:physiology*; D001812:Blood-Brain Barrier / Q000378:metabolism*; D002491:Central Nervous System Agents / Q000378:metabolism* / Q000494:pharmacology*; D006801:Humans; D010539:Permeability
chemical_list: D018435:ATP Binding Cassette Transporter, Subfamily B; D002491:Central Nervous System Agents